Network Working Group                                 S. Kille, WG Chair
Request for Comments: 1566                              ISODE Consortium
Category: Standards Track                               N. Freed, Editor
                                                                Innosoft
                                                            January 1994


                          Mail Monitoring MIB

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Table of Contents

   1. Introduction ................................................. 2
   2. The SNMPv2 Network Management Framework ...................... 2
   2.1 Object Definitions .......................................... 2
   3. Message Flow Model ........................................... 3
   4. MTA Objects .................................................. 3
   5. Definitions .................................................. 4
   6. Acknowledgements .............................................19
   7. References ...................................................19
   8. Security Considerations ......................................19
   9. Authors' Addresses ...........................................20

1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, this memo extends the basic Network Services
   Monitoring MIB [5] to allow monitoring of Message Transfer Agents
   (MTAs). It may also be used to monitor MTA components within
   gateways.

2.  The SNMPv2 Network Management Framework

   The SNMPv2 Network Management Framework consists of four major
   components.  They are:

      o  RFC 1442 [1] which defines the SMI, the mechanisms used for
         describing and naming objects for the purpose of management.

      o  STD 17, RFC 1213 [2] defines MIB-II, the core set of managed
         objects for the Internet suite of protocols.

      o  RFC 1445 [3] which defines the administrative and other
         architectural aspects of the framework.

      o  RFC 1448 [4] which defines the protocol used for network
         access to managed objects.

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

2.1  Object Definitions

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the subset of Abstract Syntax Notation One (ASN.1)
   defined in the SMI.  In particular, each object type is named by an
   OBJECT IDENTIFIER, an administratively assigned name.  The object
   type together with an object instance serves to uniquely identify a
   specific instantiation of the object.  For human convenience, we
   often use a textual string, termed the descriptor, to refer to the
   object type.

3.  Message Flow Model

   A general model of message flow inside an MTA has to be presented
   before a MIB can be described. Generally speaking, message flow
   occurs in four steps:

   (1)  Messages are received by the MTA from User Agents, Message
        Stores, other MTAs, and gateways.

   (2)  The "next hop" for the each message is determined. This is
        simply the destination the message is to be transmitted to;
        it may or may not be the final destination of the message.
        Multiple "next hops" may exist for a single message (as a
        result of either having multiple recipients or distribution
        list expansion); this may make it necessary to duplicate
        messages.

   (3)  Messages are converted into the format that's appropriate
        for the next hop.

   (4)  Messages are transmitted to the appropriate destination,
        which may be a User Agent, Message Store, another MTA, or
        gateway.

   Storage of messages in the MTA occurs at some point during this
   process. However, it is important to note that storage may occur at
   different and possibly even multiple points during this process. For
   example, some MTAs expand messages into multiple copies as they are
   received. In this case (1), (2), and (3) may all occur prior to
   storage.  Other MTAs store messages precisely as they are received
   and perform all expansions and conversions during retransmission
   processing. So here only (1) occurs prior to storage.  This leads to
   situations where, in general, a measurement of messages received may
   not equal a measurement of messages in store, or a measurement of
   messages stored may not equal a measurement of messages
   retransmitted, or both.

4.  MTA Objects

   If there are one or more MTAs on the host, the following mta group
   may be used to monitor them. Any number of the MTAs on a host may be
   monitored. Each MTA is dealt with as a separate application and has
   its own applTable entry in the Network Services Monitoring MIB.

   The MIB described in this document covers only the portion which is
   specific to the monitoring of MTAs. The network service related part
   of the MIB is covered in a separate document [5].

5.  Definitions

   MTA-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       OBJECT-TYPE, Counter32, Gauge32
         FROM SNMPv2-SMI
       DisplayString, TimeInterval
         FROM SNMPv2-TC
       mib-2
         FROM RFC1213-MIB
       applIndex
         FROM APPLICATION-MIB;

   mta MODULE-IDENTITY
       LAST-UPDATED "9311280000Z"
       ORGANIZATION "IETF Mail and Directory Management Working Group"
       CONTACT-INFO
         "        Ned Freed

          Postal: Innosoft International, Inc.
                  250 West First Street, Suite 240
                  Claremont, CA  91711
                  US

          Tel: +1 909 624 7907
          Fax: +1 909 621 5319

          E-Mail: ned@innosoft.com"
       DESCRIPTION
         "The MIB module describing Message Transfer Agents (MTAs)"
       ::= { mib-2 28 }

   mtaTable OBJECT-TYPE
       SYNTAX SEQUENCE OF MtaEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The table holding information specific to an MTA."
       ::= {mta 1}

   mtaEntry OBJECT-TYPE
       SYNTAX MtaEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The entry associated with each MTA."
       INDEX {applIndex}

       ::= {mtaTable 1}

   MtaEntry ::= SEQUENCE {
       mtaReceivedMessages
         Counter32,
       mtaStoredMessages
         Gauge32,
       mtaTransmittedMessages
         Counter32,
       mtaReceivedVolume
         Counter32,
       mtaStoredVolume
         Gauge32,
       mtaTransmittedVolume
         Counter32,
       mtaReceivedRecipients
         Counter32,
       mtaStoredRecipients
         Gauge32,
       mtaTransmittedRecipients
         Counter32
   }

   mtaReceivedMessages OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of messages received since MTA initialization."
       ::= {mtaEntry 1}

   mtaStoredMessages OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of messages currently stored in the MTA."
       ::= {mtaEntry 2}

   mtaTransmittedMessages OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of messages transmitted since MTA initialization."
       ::= {mtaEntry 3}

   mtaReceivedVolume OBJECT-TYPE
       SYNTAX Counter32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages received since MTA
         initialization, measured in kilo-octets.  This volume should
         include all transferred data that is logically above the mail
         transport protocol level.  For example, an SMTP-based MTA
         should use the number of kilo-octets in the message header
         and body, while an X.400-based MTA should use the number of
         kilo-octets of P2 data."
       ::= {mtaEntry 4}

   mtaStoredVolume OBJECT-TYPE
       SYNTAX Gauge32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages currently stored in the MTA,
         measured in kilo-octets.  This volume should include all
         stored data that is logically above the mail transport
         protocol level.  For example, an SMTP-based MTA should
         use the number of kilo-octets in the message header and
         body, while an X.400-based MTA would use the number of
         kilo-octets of P2 data."
       ::= {mtaEntry 5}

   mtaTransmittedVolume OBJECT-TYPE
       SYNTAX Counter32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages transmitted since MTA
         initialization, measured in kilo-octets.  This volume should
         include all transferred data that is logically above the mail
         transport protocol level.  For example, an SMTP-based MTA
         should use the number of kilo-octets in the message header
         and body, while an X.400-based MTA should use the number of
         kilo-octets of P2 data."
       ::= {mtaEntry 6}

   mtaReceivedRecipients OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         received since MTA initialization.  Recipients this MTA
         had no responsibility for should not be counted even if
         information about such recipients is available."
       ::= {mtaEntry 7}

   mtaStoredRecipients OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         currently stored in the MTA.  Recipients this MTA had no
         responsibility for should not be counted."
       ::= {mtaEntry 8}

   mtaTransmittedRecipients OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         transmitted since MTA initialization.  Recipients this MTA
         had no responsibility for should not be counted."
       ::= {mtaEntry 9}


   -- MTAs typically group inbound reception, queue storage, and
   -- outbound transmission in some way. In the most extreme case
   -- information will be maintained for each different entity that
   -- receives messages and for each entity the MTA stores messages for
   -- and delivers messages to.  Other MTAs may elect to treat all
   -- reception equally, all queue storage equally, all deliveries
   -- equally, or some combination of this.

   -- In any case, a grouping abstraction is an extremely useful for
   -- breaking down the activities of an MTA. For purposes of labelling
   -- this will be called a "group" in this MIB.

   -- Each group contains all the variables needed to monitor all aspects
   -- of an MTA's operation.  However, the fact that all groups contain
   -- all possible variables does not imply that all groups must use all
   -- possible variables. For example, a single group might be used to
   -- monitor only one kind of event (inbound processing, outbound
   -- processing, or storage). In this sort of configuration all unused
   -- counters would be inaccessible; e.g., returning either a
   -- noSuchName error (for an SNMPv1 get), or a noSuchInstance
   -- exception (for an SNMPv2 get).

   -- Groups are not necessarily mutually exclusive. A given event may
   -- be recorded by more than one group, a message may be seen as
   -- stored by more than one group, and so on.  Groups should be all
   -- inclusive, however: if groups are implemented all aspects of an
   -- MTA's operation should be registered in at least one group. This
   -- freedom lets implementors use different sets of groups to
   -- provide differents "views" of an MTA.

   -- The possibility of overlap between groups means that summing
   -- variables across groups may not produce values equal to those in
   -- the mtaTable. mtaTable should always provide accurate information
   -- about the MTA as a whole.

   -- The term "channel" is often used in MTA implementations; channels
   -- are usually, but not always, equivalent to a group. However,
   -- this MIB does not use the term "channel" because there is no
   -- requirement that an MTA supporting this MIB has to map its
   -- "channel" abstraction one-to-one onto the MIB's group abstration.

   mtaGroupTable OBJECT-TYPE
       SYNTAX SEQUENCE OF MtaGroupEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The table holding information specific to each MTA group."
       ::= {mta 2}

   mtaGroupEntry OBJECT-TYPE
       SYNTAX MtaGroupEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The entry associated with each MTA group."
       INDEX {applIndex, mtaGroupIndex}
       ::= {mtaGroupTable 1}

   MtaGroupEntry ::= SEQUENCE {
       mtaGroupIndex
           INTEGER,
       mtaGroupReceivedMessages
           Counter32,
       mtaGroupRejectedMessages
           Counter32,
       mtaGroupStoredMessages
           Gauge32,
       mtaGroupTransmittedMessages
           Counter32,
       mtaGroupReceivedVolume
           Counter32,
       mtaGroupStoredVolume
           Gauge32,
       mtaGroupTransmittedVolume
           Counter32,
       mtaGroupReceivedRecipients
           Counter32,
       mtaGroupStoredRecipients
           Gauge32,
       mtaGroupTransmittedRecipients
           Counter32,
       mtaGroupOldestMessageStored
           TimeInterval,
       mtaGroupInboundAssociations
           Gauge32,
       mtaGroupOutboundAssociations
           Gauge32,
       mtaGroupAccumulatedInboundAssociations
           Counter32,
       mtaGroupAccumulatedOutboundAssociations
           Counter32,
       mtaGroupLastInboundActivity
           TimeInterval,
       mtaGroupLastOutboundActivity
           TimeInterval,
       mtaGroupRejectedInboundAssociations
           Counter32,
       mtaGroupFailedOutboundAssociations
           Counter32,
       mtaGroupInboundRejectionReason
           DisplayString,
       mtaGroupOutboundConnectFailureReason
           DisplayString,
       mtaGroupScheduledRetry
           TimeInterval,
       mtaGroupMailProtocol

           OBJECT IDENTIFIER,
       mtaGroupName
           DisplayString
   }

   mtaGroupIndex OBJECT-TYPE
       SYNTAX INTEGER (1..2147483647)
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The index associated with a group for a given MTA."
       ::= {mtaGroupEntry 1}

   mtaGroupReceivedMessages OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of messages received to this group since MTA
         initialization."
       ::= {mtaGroupEntry 2}

   mtaGroupRejectedMessages OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of messages rejected by this group since MTA
         initialization."
       ::= {mtaGroupEntry 3}

   mtaGroupStoredMessages OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of messages currently stored in this
         group's queue."
       ::= {mtaGroupEntry 4}

   mtaGroupTransmittedMessages OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of messages transmitted by this group since MTA
         initialization."
       ::= {mtaGroupEntry 5}

   mtaGroupReceivedVolume OBJECT-TYPE
       SYNTAX Counter32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages received to this group since
         MTA initialization, measured in kilo-octets.  This volume
         should include all transferred data that is logically above
         the mail transport protocol level.  For example, an
         SMTP-based MTA should use the number of kilo-octets in the
         message header and body, while an X.400-based MTA should use
         the number of kilo-octets of P2 data."
       ::= {mtaGroupEntry 6}

   mtaGroupStoredVolume OBJECT-TYPE
       SYNTAX Gauge32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages currently stored in this
         group's queue, measured in kilo-octets.  This volume should
         include all stored data that is logically above the mail
         transport protocol level.  For example, an SMTP-based
         MTA should use the number of kilo-octets in the message
         header and body, while an X.400-based MTA would use the
         number of kilo-octets of P2 data."
       ::= {mtaGroupEntry 7}

   mtaGroupTransmittedVolume OBJECT-TYPE
       SYNTAX Counter32
       UNITS "K-octets"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total volume of messages transmitted by this group
         since MTA initialization, measured in kilo-octets.  This
         volume should include all transferred data that is logically
         above the mail transport protocol level.  For example, an
         SMTP-based MTA should use the number of kilo-octets in the
         message header and body, while an X.400-based MTA should use
         the number of kilo-octets of P2 data."
       ::= {mtaGroupEntry 8}

   mtaGroupReceivedRecipients OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         received to this group since MTA initialization.
         Recipients this MTA had no responsibility for should not
         be counted."
       ::= {mtaGroupEntry 9}

   mtaGroupStoredRecipients OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         currently stored in this group's queue.  Recipients this
         MTA had no responsibility for should not be counted."
       ::= {mtaGroupEntry 10}

   mtaGroupTransmittedRecipients OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of recipients specified in all messages
         transmitted by this group since MTA initialization.
         Recipients this MTA had no responsibility for should not
         be counted."
       ::= {mtaGroupEntry 11}

   mtaGroupOldestMessageStored OBJECT-TYPE
       SYNTAX TimeInterval
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "Time since the oldest message in this group's queue was
          placed in the queue."
       ::= {mtaGroupEntry 12}

   mtaGroupInboundAssociations OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of current associations to the group, where the
          group is the responder."
       ::= {mtaGroupEntry 13}

   mtaGroupOutboundAssociations OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The number of current associations to the group, where the
         group is the initiator."
       ::= {mtaGroupEntry 14}

   mtaGroupAccumulatedInboundAssociations OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of associations to the group since MTA
         initialization, where the group is the responder."
       ::= {mtaGroupEntry 15}

   mtaGroupAccumulatedOutboundAssociations OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of associations from the group since MTA
          initialization, where the group was the initiator."
       ::= {mtaGroupEntry 16}

   mtaGroupLastInboundActivity OBJECT-TYPE
       SYNTAX TimeInterval
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "Time since the last time that this group had an active
         inbound association for purposes of message reception."
       ::= {mtaGroupEntry 17}

   mtaGroupLastOutboundActivity OBJECT-TYPE
       SYNTAX TimeInterval
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "Time since the last time that this group had an
         outbound association for purposes of message delivery."
       ::= {mtaGroupEntry 18}

   mtaGroupRejectedInboundAssociations OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number of inbound associations the group has
         rejected, since MTA initialization."
       ::= {mtaGroupEntry 19}

   mtaGroupFailedOutboundAssociations OBJECT-TYPE
       SYNTAX Counter32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The total number associations where the group was the
         initiator and association establishment has failed,
         since MTA initialization."
       ::= {mtaGroupEntry 20}

   mtaGroupInboundRejectionReason OBJECT-TYPE
       SYNTAX DisplayString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The failure reason, if any, for the last association this
         group refused to respond to. An empty string indicates that
         the last attempt was successful.  If no association attempt
         has been made since the MTA was initializaed the value
         should be 'never'."
       ::= {mtaGroupEntry 21}

   mtaGroupOutboundConnectFailureReason OBJECT-TYPE
       SYNTAX DisplayString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The failure reason, if any, for the last association attempt
         this group initiated. An empty string indicates that the last
         attempt was successful.  If no association attempt has been
         made since the MTA was initialized the value should be
         'never'."
       ::= {mtaGroupEntry 22}

   mtaGroupScheduledRetry OBJECT-TYPE
       SYNTAX TimeInterval
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "The time when this group is scheduled to next attempt to
          make an association."
       ::= {mtaGroupEntry 23}

   mtaGroupMailProtocol OBJECT-TYPE
       SYNTAX OBJECT IDENTIFIER
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "An identification of the protocol being used by this group.
         For an group employing OSI protocols, this will be the
         Application Context.  For Internet applications, the IANA
         maintains a registry of the OIDs which correspond to well-known
         message transfer protocols.  If the application protocol is
         not listed in the registry, an OID value of the form
         {applTCPProtoID port} or {applUDProtoID port} are used for
         TCP-based and UDP-based protocols, respectively.  In either
         case 'port' corresponds to the primary port number being
         used by the group.  applTCPProtoID and applUDPProtoID are
         defined in [5]."
       ::= {mtaGroupEntry 24}

   mtaGroupName OBJECT-TYPE
       SYNTAX DisplayString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "A descriptive name for the group. If this group connects to
         a single remote MTA this should be the name of that MTA. If
         this in turn is an Internet MTA this should be the domain name.
         For an OSI MTA it should be the string encoded distinguished
         name of the managed object using the format defined in RFC-1485.
         For X.400(1984) MTAs which do not have a Distinguished Name,
         the RFC-1327 syntax 'mta in globalid' should be used."
       ::= {mtaGroupEntry 25}

   mtaGroupAssociationTable OBJECT-TYPE
       SYNTAX SEQUENCE OF MtaGroupAssociationEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The table holding information regarding the associations
          for each MTA group."
       ::= {mta 3}

   mtaGroupAssociationEntry OBJECT-TYPE
       SYNTAX MtaGroupAssociationEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
         "The entry holding information regarding the associations
          for each MTA group."
       INDEX {applIndex, mtaGroupIndex, mtaGroupAssociationIndex}
       ::= {mtaGroupAssociationTable 1}

   MtaGroupAssociationEntry ::= SEQUENCE {
       mtaGroupAssociationIndex
           INTEGER
   }

   mtaGroupAssociationIndex OBJECT-TYPE
       SYNTAX INTEGER (1..2147483647)
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
         "Reference into association table to allow correlation of
          this group's active associations with the association table."
       ::= {mtaGroupAssociationEntry 1}

   -- Conformance information

   mtaConformance OBJECT IDENTIFIER ::= {mta 4}

   mtaGroups      OBJECT IDENTIFIER ::= {mtaConformance 1}
   mtaCompliances OBJECT IDENTIFIER ::= {mtaConformance 2}


   -- Compliance statements

   mtaCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
         "The compliance statement for SNMPv2 entities which
          implement the Mail Monitoring MIB for basic
          monitoring of MTAs."
       MODULE  -- this module
         MANDATORY-GROUPS {mtaGroup}
       ::= {mtaCompliances 1}


   mtaAssocCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
         "The compliance statement for SNMPv2 entities which
          implement the Mail Monitoring MIB for monitoring of
          MTAs and their associations."
       MODULE  -- this module
         MANDATORY-GROUPS {mtaGroup, mtaAssocGroup}
       ::= {mtaCompliances 2}

   -- Units of conformance

   mtaGroup OBJECT-GROUP
       OBJECTS {
         mtaReceivedMessages, mtaStoredMessages,
         mtaTransmittedMessages, mtaReceivedVolume, mtaStoredVolume,
         mtaTransmittedVolume, mtaReceivedRecipients,
         mtaStoredRecipients, mtaTransmittedRecipients,
         mtaGroupReceivedMessages, mtaGroupRejectedMessages,
         mtaGroupStoredMessages, mtaGroupTransmittedMessages,
         mtaGroupReceivedVolume, mtaGroupStoredVolume,
         mtaGroupTransmittedVolume, mtaGroupReceivedRecipients,
         mtaGroupStoredRecipients, mtaGroupTransmittedRecipients,
         mtaGroupOldestMessageStored, mtaGroupInboundAssociations,
         mtaGroupOutboundAssociations,
         mtaGroupAccumulatedInboundAssociations,
         mtaGroupAccumulatedOutboundAssociations,
         mtaGroupLastInboundActivity, mtaGroupLastOutboundActivity,
         mtaGroupRejectedInboundAssociations,
         mtaGroupFailedOutboundAssociations,
         mtaGroupInboundRejectionReason,
         mtaGroupOutboundConnectFailureReason,
         mtaGroupScheduledRetry, mtaGroupMailProtocol, mtaGroupName}
       STATUS current
       DESCRIPTION
         "A collection of objects providing basic monitoring of MTAs."
       ::= {mtaGroups 1}

   mtaAssocGroup OBJECT-GROUP
       OBJECTS {
         mtaGroupAssociationIndex}
       STATUS current
       DESCRIPTION
         "A collection of objects providing monitoring of MTA
          associations."
       ::= {mtaGroups 2}

   END

6.  Acknowledgements

   This document is a product of the Mail and Directory Management
   (MADMAN) Working Group. It is based on an earlier MIB designed by S.
   Kille, T.  Lenggenhager, D. Partain, and W. Yeong.

7.  References

  [1]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
       of Management Information for version 2 of the Simple Network
       Management Protocol (SNMPv2)", RFC 1442, SNMP Research, Inc.,
       Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

  [2]  McCloghrie, K., and M. Rose, Editors, "Management Information
       Base for Network Management of TCP/IP-based internets: MIB-II",
       STD 17, RFC 1213, Hughes LAN Systems, Performance Systems
       International, March 1991.

  [3]  Galvin, J., and K. McCloghrie, K., "Administrative Model for
       version 2 of the Simple Network Management Protocol (SNMPv2)",
       RFC 1445, Trusted Information Systems, Hughes LAN Systems, April
       1993.

  [4]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
       Operations for version 2 of the Simple Network Management
       Protocol (SNMPv2)", RFC 1448, SNMP Research, Inc., Hughes LAN
       Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

  [5]  Kille, S., WG Chair, and N. Freed, Editor, "The Network Services
       Monitoring MIB", RFC 1565, ISODE Consortium, Innosoft, January
       1994.

8.  Security Considerations

   Security issues are not discussed in this memo.

9.  Authors' Addresses

   Steve Kille, WG Chair
   ISODE Consortium
   The Dome, The Square
   Richmond TW9 1DT
   UK

   Phone: +44 81 332 9091
   EMail: S.Kille@isode.com


   Ned Freed, Editor
   Innosoft International, Inc.
   250 West First Street, Suite 240
   Claremont, CA 91711
   USA

   Phone: +1 909 624 7907
   Fax: +1 909 621 5319
   EMail: ned@innosoft.com